The act of breaking up with your boyfriend/girlfriend and a week later you fornicate with them knowing that in the end you are going to tell them you want to be "just friends". After the act is done you also throw down $40 on their desk and immediately leave.

Last night my roommates ex boyfriend was pulling a humps when he came over after he had been drinking, had sex with her, told her that he wants to be friends and then left $40 for a previous purchase. He then left and walked home.